to a great extent because of the relationship between the terrifying ralph -- >> ralph gracie looks at a problem. those eyes are menacing. >> -- and this man, kurt osiander. a beloved figure in the jiu-jitsu community because of his remarkably honest and unvarnished "move of the week" videos. >> so he gets stuck in a side control here, and he gave the guy under hook. boom. you [bleep] up a long time ago. it's so bad now that you're going to have to work really hard. up and scoot up, in, to my knees. head up. getting side control on the other guy. >> when you see an mma fight -- when they strike it's usually boxing or muay thai or karate. when they throw or trip their opponent, it's judo or wrestling. but when it hits the ground, you better know brazilian jiu-jitsu. object - to choke your opponent or lock one of his extremities in such a way as to make them submit. i do not want this. getting my guard broken. that's bad. it sucks. there's full mount. arm bar. ezekiel choke. rear naked choke. bow and arrow. then, as they say, my choices become very limited. it's tap, snap, or nap. >> gra